search for: construting

Hi there, I know it''s not a very construtive question but...=/ what is that IDE in the blog screencast at rubyonrails.com? I couldn''t yet find a very good IDE for Ruby and I really liked that one! =) Thank you... -- Posted via http://www.ruby-forum.com/.

If possible I'd like to produce a function that applies a formula to a column in a matrix (essentially calculating the mse) and then inserts it between values of a an array ... confusing I know, here is an example of what I'm trying to accomplish: ## create a matrix (a <- matrix(c(3,6,4,8,5,9,12,15),nrow=4)) ## get the mean of all columns (b <- apply(a,2,mean)) ## calculate the mse